By M. Rasch, Scott Slaughter
ISBN-10: 1557552754
ISBN-13: 9781557552754
Here is a publication for intermediate to complex programmers that covers innovations quite often skipped over of different programming books. notebook Underground isn't a criminal's instruction manual; as a substitute it really is an in-depth programmer's consultant to process point programming. It covers a various diversity of unconventional programming issues and contains wide assurance of images.
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Additional resources for PC Underground: Unconventional Programming Topics
Example text
This is the reason why we use GIF graphic images. The demos which we've included on the companion CD-ROM will load your images quickly without excessive memory requirements. The standard format GIF uses a block structure not as elaborate as TIFF format but which allows for easy handling of information about resolution and number of colors. The following table describes the basic structure: Offset Length 0 3 Format ID "GIF" 3 3 Version ID, currently "87a" or "89a" 6 7 Logical Screen Descriptor Block 0dh n Global Color Map (optional), in 256-color modes Contents VGA-compatible palette (n=768 bytes) 30dh n Extension Block (optional) 30dh 10 Image Descriptor Block 317h n Local Color Map (optional), in 256-color modes VGA-compatible palette (n=768 bytes) 317h n Raster Data Block (graphic data LZW-compressed) ?
The loop continues until the entire stack has been emptied, after which the alphabet must still be updated. This is done by entering the last value as the prefix and the current code as the tail. Next, the alphabet pointer (free) is updated. If the pointer goes past the alphabet limit, the alphabet is expanded and a new maximum value (max) is set. The procedure then continues as usual. On the other hand, no further expansion occurs if the width has already reached twelve bits. Instead, the routine returns to the main loop.
A special case arises when the counter goes past the maximum (63) that can be stored in a length-byte. In this case the counter is "emptied" into the file and the count restarts. Another special case involves the endof-line. Originally, PCX was purely line-based which meant that character repetitions could not go past the end-of-line. You may have to consider this handicap in the compression especially if you're using an older paint program. When a character differs from its predecessor, the following Else branch executes.
PC Underground: Unconventional Programming Topics by M. Rasch, Scott Slaughter
by Paul
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